diff --git a/os/osinit.c b/os/osinit.c
index ddd3fce26..6ec2f1167 100644
--- a/os/osinit.c
+++ b/os/osinit.c
@@ -158,8 +158,10 @@ void
 OsInit(void)
 {
     static Bool been_here = FALSE;
+#ifndef XQUARTZ
     static const char *devnull = "/dev/null";
     char fname[PATH_MAX];
+#endif
 
     if (!been_here) {
 #if !defined(WIN32) || defined(__CYGWIN__)